Improved nut



Feb. 1,1938. A. c. M. MICHELL IMPROVED NUT Filed July 18, 1935 mums Att s Patented Feb. 1, 1938 l 'UNITED STATES PATENT OFFICE IMPROVED NUT Anthony George Maldon Michell, Melbourne,

' Australia Application July 18, 1935, Serial No. 31,961 In Great Britain June12, 1935 7 Claims. (Cl. 85 32) This invention relates to improvements in parts. The bolt 3 is-preferably formed with a screwed nuts of thekind described and claimed recess 3 in its end as indicated by dotted lines in the present applicant's Patent No. 2,005,348, isin Fig. 1. sued June 18, 1935, and consists in a method of In all these respects the nut and bolt conform 5 construction whereby the nut is manufactured in to the prior patent above cited, and the nut 5 two parts, which are by further operations aswhich is the subject of the present invention is sembled and connected together to form the comdesigned to secure all the advantages set out in plete nut. that patent, as compared with ordinary nuts,

Ordinary nuts tend to slack back or unscrew with the added advantages of increased facility when subjected to varying loads or to severe viand economy of manufacture and increased 10 bration while under load. strength of the completed nut.

As more fully explained in my Patent 2,005,348 According to the present invention the upper above referred to,'tension on a nut of the usual part of the core I is provided with a flange 6, construction tends to cause the outer threaded and the upper part of the shell 4 is formed with portion to grip the bolt and the inner portion to a recess within a rim 1, to receive the periphery 15 separate from the nut. See Figs. 2, 4, 7 and 9 of this flange and to form a shoulder for supportof said patent. 7 ing the flange 6. The lower face of theflange This invention has for its object to eliminate 6 rests evenly on the shoulder at the bottom of such tendencies by so forming and supporting the recess in the shell, as shown in Fig. 1, and the nut that the threaded portions which are subclose contact is made between the outer periphgo ject to the stresses tending to elongate the nut ery of the flangeli and the inner periphery of the are capable of elongation, axially, in a manner rim 1.

similar to the engaging part of the bolt. In other In the form of nut shown in Figs. 1 and 2 the Words, the ut s S med and supported that flange 6 and the internal periphery of the rim 1 the more v y loaded p r i ns h r f n both have the form of hexagons, the rim 1 being ticularly e threaded Portions are in a Condithus a hollow hexagon of uniform thickness.

tion of general axial tension and not under com- The sahences of th flange 6 at th angles of p s as when t n 15 Supported in the usual the hexagon, being thus fitted within the corremann spending niches of the recess in the shell, ensure- In t e acco s drawing a 1 IS an that the core I shall turn with the shell 4 about 30 ial section of a nut constructed according to the invention, the nut being shown as screwed on a suitable bolt.

Figs. 2 and 3 are views of the upper and lower faces respectively, of the nut shown in section in Fig. 1.

Figs. 4 and 5 are views, corresponding with g g forms of the upper portion small annular recess 8, slightly larger in diameter than the lower end of the conoidal part of 40 1 532;: fi if f' zgfi 3%; g l gf the core I, and into this recess the thinlower Consists of an inner part or core on 'which edge 9 of the conoidal part of the core is expanded formed the thread 2 fitting the screwed portion agamst a Shoulder formed, between the of the bolt 3, and an Outer part or shell 4 conoidal recess of the rim 4 and its annular reundin and su ortin the core. The rtion cess as shown in 45 Z? the o re l on w hlch tie thread 2 is form sd has By this means t e with f fitting 0f the a conoidal outer surface larger in diameter at its flange 5 of the core Wlthm the mm 1 0f the Shell, upper th end engaging t t end the core and shell are permanently conected toof the bolt), than at its other, or lower, end, gather to form t e co p etenut. where its diameter only slightly exceeds the di- It will however be understood that, while the 50 ameter of the bolt 3.v The shell 4 is formed with expanding 0f the edge 9 into the recess 8 p e s a corresponding conoidal hollow or recess, so that the detac of the tW0 Parts Of the nut u when the core I and shell 4 are assembled to form ing handling or use, it does not prevent the core the complete nut as shown in the figures only a from extending axially under the tension of the narrow interspace 5 remains between the two bolt, the caulked edgev 9 being capable of being 55 their common axis when the nut is screwed on the bolt by a spanner engaging, in the usual way, the external hexagonal faces of the shell.

Instead of being hexagonal the shell 4 and flange 6 may be square, or of other shape usual in 35 nuts.

At the lower end of the shell 4 is formed a applications of a cylindrical cutter.

displaced slightly downwards, but not upwards, with respect to the shell.

In the alternative forms of the nut shown in Figs. 4and 5, the flange 6 is of curvilinear outline and flts a corresponding curvilinear recess in the rim I of the nut along the curved polygonal line of contact, l0. These forms have the advantage, as compared with the hexagonal form shown in Fig. 2, that the recess in the rim 1 is more easily formed by machining processes. This is especially the case if, as shown in Fig. 5, the saliences of the line Ill consist of circular arcs whereby the recess in the rim can be formed by successive The shell shown in these figures, as well as that shown in Fig. 2 may however be formed by forging, or

stamping, without any cutting, or similar machining, operations.

It is to be understood that the nuts shown in Figs. 4 and 5 are similar to that described above in connection with Figs. 1 and 2 in all respects other than the form of the polygonal line I0, and Fig. 3 is to be understood as representing the lower faces of nuts conforming to all of these figures.

What I claim is:

1. A nut comprising a core having a circumferentially continuous internally threaded conoidal portion and an integral flange at the larger end of said portion, said flange being formed with circumferential saliences, a separately formed shell surrounding the core, circumferentially spaced from its conoidal portion and constructed with a recess having a shoulder for supporting said flange and having niches corresponding with said saliences, and a rim at the smaller end of the conoidal portion adapted to engage the shell.

2. A nut comprising a core having a circumferentially continuous internally threaded conoidal portion and an integral flange at the larger end of said portion, said flange being formed with circumferential saliences, a separately formed shell surrounding the core, circumferentially spaced from its conoidal portion and constructed with a recess having niches corresponding with said saliences, the base of said recess forming a seat for supporting the flange of the core, and a rim at the smaller end of the conoidal portion adapted to engage the shell.

3. A nut comprising a core having a circumferentially continuous internally threaded conoidal portion and an integral flange at the larger end of said portion, said flange being formed with circumferential saliences, a separately formed shell surrounding the core, circumferentially spaced from its conoidal portion and constructed with a recess having niches corresponding with said saliences, the base of said recess forming a seat for supporting the flange of the core, a recess at the lower end of the shell forming a shoulder, and said core being permanently attached to the shell by having its lower end expanded into the latter recess under said shoulder.

4. A nut comprising an internally threaded longitudinally expansible threaded core, a separately formed shell, said core and shell being interconnected at one end against relative longitudinal movement by a non-rotative connection and being circumferentially separated from each other below said connection.

5. A nut comprising a core having an integral flange at one of its ends and a longitudinally expansible internally threaded conoidal portion, combined with a separately formed shell interconnected With said flange and surrounding but circumferentially spaced from the conoidal portion of the core. I

6. A nut comprising an internally threaded core 'fitted within a separately formed coaxial shell and circumferentially spaced therefrom, said core having a flange near one of its ends recessed in said shell for the purposes set forth.

'7. A nut comprising an internally threaded core fltted within a separately formed shell surrounding said core and circumferentially spaced therefrom, said core being supported on said shell by a flange near one of its ends having circum ferentially saliences fitting within corresponding niches in said shell.

ANTHONY GEORGE MALDON MICHELL. 

